1660431066257 has 2 divisors, whose sum is σ = 1660431066258. Its totient is φ = 1660431066256.

The previous prime is 1660431066149. The next prime is 1660431066289. The reversal of 1660431066257 is 7526601340661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1641701501521 + 18729564736 = 1281289^2 + 136856^2 .

It is a cyclic number.

It is not a de Polignac number, because 1660431066257 - 2¹² = 1660431062161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1660431066857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 830215533128 + 830215533129.

It is an arithmetic number, because the mean of its divisors is an integer number (830215533129).

Almost surely, 2^{1660431066257} is an apocalyptic number.

It is an amenable number.

1660431066257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1660431066257 is an equidigital number, since it uses as much as digits as its factorization.

1660431066257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 47.

The spelling of 1660431066257 in words is "one trillion, six hundred sixty billion, four hundred thirty-one million, sixty-six thousand, two hundred fifty-seven".